package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.CategoryDTO;
import com.sky.dto.CategoryPageQueryDTO;
import com.sky.entity.Category;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.CategoryMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.CategoryService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class CategoryServiceImpl implements CategoryService {

    @Autowired
    private CategoryMapper categoryMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 分类分页查询
     * @param categoryPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(CategoryPageQueryDTO categoryPageQueryDTO){
        // 开始分页查询(设置分页参数)
        PageHelper.startPage(categoryPageQueryDTO.getPage(), categoryPageQueryDTO.getPageSize());
        // 获取结果
        Page<Category> page = categoryMapper.pageQuery(categoryPageQueryDTO);
        // 返回结果
        return new PageResult(page.getTotal(), page.getResult());

    }

    /**
     * 新增分类
     * @param  categoryDTO
     * @return
     */
    @Override
    public void save(CategoryDTO categoryDTO){
        Category category = new Category();
        // 属性拷贝
        BeanUtils.copyProperties(categoryDTO, category);
        // 分类状态默认为禁用状态0
        category.setStatus(StatusConstant.DISABLE);

        categoryMapper.insert(category);
    }

    /**
     * 根据id删除分类
     * @param  id
     *
     */
    @Override
    public void deleteById(Long id) {
        //判断当前分类是否关联了菜品，如果已经关联，则无法删除
        //select count(*) from dish where category_id = ?
        Integer count1 = dishMapper.countByCategoryId(id);
        if (count1 > 0) {
            //当前分类下有菜品，不能删除
            throw new DeletionNotAllowedException(MessageConstant.CATEGORY_BE_RELATED_BY_DISH);
        }

        //判断当前分类是否关联了套餐，如果已经关联，则无法删除
        Integer count2 = setmealMapper.countByCategoryId(id);
        if (count2 > 0) {
            //当前分类下有套餐，不能删除
            throw new DeletionNotAllowedException(MessageConstant.CATEGORY_BE_RELATED_BY_SETMEAL);
        }
        categoryMapper.delete(id);
    }

    /**
     * 启用禁用分类
     * @param status
     * @param id
     */
    @Override
    public void startOrStop(Integer status, Long id){
        Category category = Category.builder()
                .id(id)
                .status(status)
                .build();

        categoryMapper.update(category);

    }

    /**
     * 修改分类
     * @param  categoryDTO
     */
    @Override
    public void update(CategoryDTO categoryDTO) {
        Category category = new Category();
        BeanUtils.copyProperties(categoryDTO, category);
        categoryMapper.update(category);
    }

    /**
     * 查询分类
     * @param type
     * @return
     */
    @Override
    public List<Category> list(Integer type){
        List<Category> list = categoryMapper.list(type);
        return list;
    }
}
